Aberedw is situated on the banks of the river Edw near its confluence with the river Wye in the county of Powys, Mid Wales. It sits alongside the B4567 road between Llanelwedd and Erwood. Visitors will find a fine 13th century church, dedicated to the British saint St Cewydd (patron saint of rain). The building is most notable for its squat stone tower with a pyramidal roof. It includes an interesting balustrade and a 14th-century screen, which survived restorations in Tudor times and later in the 19th century. Another church can be found in nearby Llanbadarn-y-Garreg, just 2.7 miles north east of Aberedw.

There were two castles built in Aberedw: an early motte and bailey settlement and a later stone fortification. At one time, Llywelyn the Last, the last Prince of Wales, occupied the stone castle and it is believed that he used a cave close by to hide from enemies during invasions. The cave is now named Llywelyn's Cave in memory of the prince, who was murdered in nearby Cilmery.